Have you tryed using denoiser?
Have you tred to tweak its radius?
The attached image is from Keyshot or Corona? I would say it looks noisy.
If the noise is caused by glossy reflections, I would suggest turning up GIvsAA - to 32-64, but probably not more.
If the noise is caused by small details such as bump maps, scratch maps, I would suggest turning down GIvsAA - to 8-4, but not less.
I don’t see much problems with noise even with slight bump texture as scratches (Sieger one) and a bit of anisotropic reflections.
I let it render for approx. 50 passes on not really fast computer (I7 5820K).
First render is without noise reduction, the second one has 0,3 noise reduction. If I’d go higher with noise reduction, then the smallest scratches start to disappear of course.
Default settings.
FunkyIMG-is-DOWN-c5d5047d15384598b0db4f05953a9633.html (17.1 KB)
25passes, 0.4 denoise
max2017.7z (1.96 MB)